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In work the questions of hardening of a surface layer of a detail by means of ultrasonic fluctuations are opened. The developed device for forming ultrasonic longitudinal-torsional oscillations is described, which makes it possible to substantially modify the properties of the surface layers of the parts.doi:10.1051/matecconf/201822401052 fatcat:otpzmggevbgq5e24mahsdbfkmi